package wemedia.gateway.filter;

import com.heima.utils.common.AppJwtUtil;
import io.jsonwebtoken.Claims;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang.StringUtils;
import org.springframework.cloud.gateway.filter.GatewayFilterChain;
import org.springframework.cloud.gateway.filter.GlobalFilter;
import org.springframework.core.Ordered;
import org.springframework.http.HttpStatus;
import org.springframework.http.server.reactive.ServerHttpRequest;
import org.springframework.http.server.reactive.ServerHttpResponse;
import org.springframework.stereotype.Component;
import org.springframework.web.server.ServerWebExchange;
import reactor.core.publisher.Mono;

@Component
@Slf4j
public class AuthorizeFilter implements Ordered, GlobalFilter {
    @Override
    public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {
//        1. 获取请求响应对象
        ServerHttpRequest request = exchange.getRequest();
        ServerHttpResponse response = exchange.getResponse();

//        2. 放行登录请求
        if(request.getURI().getPath().contains("/login")){
            return chain.filter(exchange);
        }
//        3. 获取请求头中的token
        String token = request.getHeaders().getFirst("token");

//        4. 判断token是否存在
        if(StringUtils.isBlank(token)){
            response.setStatusCode(HttpStatus.UNAUTHORIZED);
            return response.setComplete();
        }
//        5. 校验token是否有效
        try {
            Claims claimsBody = AppJwtUtil.getClaimsBody(token);
            //是否是过期
            int result = AppJwtUtil.verifyToken(claimsBody);
            if(result == 1 || result  == 2){
                response.setStatusCode(HttpStatus.UNAUTHORIZED);
                return response.setComplete();
            }
//        获取token中的用户ID -------------------------------------
            Long id = claimsBody.get("id", Long.class);
            if(id==null || id==0){
                response.setStatusCode(HttpStatus.UNAUTHORIZED);
                return response.setComplete();
            }
            //将用户id发送到下游微服务
            ServerHttpRequest serverHttpRequest = request.mutate().headers(httpHeaders -> httpHeaders.add("userId", id + "")).build();

            ServerWebExchange webExchange = exchange.mutate().request(serverHttpRequest).build();

            return chain.filter(webExchange);
        } catch (Exception e) {
            e.printStackTrace();
        }
        return chain.filter(exchange);
    }

    @Override
    public int getOrder() {
        return 0;
    }
}
